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J2ee - Difference between war and ear Application

Posted on 2014-03-10
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Last Modified: 2014-03-13
Hi All,
I have been working on core java for some time. I am now moving into J2ee web programming.

Can someone list differences between ear and war files produced for java app.

I am looking for a in depth detailed explanation  and not just couple of lines.

Thanks
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Question by:crazywolf2010
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Valeri earned 2000 total points
ID: 39917276
taken from internet, but very good explanation:

WAR - Web ARchive

As the name suggests this file format is used to package all the components of a Web Application. It may contain JARs, JSPs, Servlets, HTMLs, GIFs, etc. The purpose of this archive format is same as that of the JAR - to make the deployment, shipping, and in turn the maintenance process easier. This will have an XML file named web.xml as the Deployment Descriptor. This Deployment Descriptor is used by the Web Container to deploy the web application correctly.

EAR - Enterprise ARchive

An enterprise application may be composed of several Web Applications and other independent JARs. This archive file format is used in those cases to bundle all the components of an enterprise application into a single file. Again the purpose is same - making deployment, shipping, and hence the maintenance easier. Since, an enterprise application may have several Web Applications as its components, hence an EAR file may contain WARs and JARs. An EAR also contains an XML-based Deployement Descriptor, which is used by the Application Server to deploy the enterprise application correctly.
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